Abstract: A spin-through drive rod centralizer consisting of a stator constructed of plastic, or other appropriate material, which is mounted on a rotor attached to the body of the drive rod, which provides the bearing surface for rotation of the rotor within the stator. The stator is equipped with multiple vanes which extend to the full internal diameter of the production tubing. In one configuration, the radially oriented vanes have cut-outs which allow the tip of the vane to compress inward, allowing passage through tight spots in the tubing, then rebounding to the full ID of the tubing. In another configuration, the vanes are tangentially attached to the stator body, such that they bend in a circumferential direction to allow passage through tubing tight spots, then rebound to full tubing ID.

Abstract: A spin-through drive rod centralizer consisting of a stator constructed of plastic, or other appropriate material, which is mounted on a rotor attached to the body of the drive rod, which provides the bearing surface for rotation of the rotor within the stator. The stator is equipped with multiple vanes which extend to the full internal diameter of the production tubing. In one configuration, the radially oriented vanes have cut-outs which allow the tip of the vane to compress inward, allowing passage through tight spots in the tubing, then rebounding to the full ID of the tubing. In another configuration, the vanes are tangentially attached to the stator body, such that they bend in a circumferential direction to allow passage through tubing tight spots, then rebound to full tubing ID.

Abstract: A spin-through rod centralizer consisting of a stator mounted on the rod coupling which provides the bearing surface for rotation of the coupling within the stator. The stator is restrained from such axial movement by two steel “washers” that are captured between the rod shoulders and the coupling when the connection between two rods is made up. The washers are slightly larger in diameter than the coupling and thereby keep the stator located on the coupling, yet do not restrict the relative rotation between the coupling and the stator. An alternative configuration uses a coupling with a shoulder at one end that acts as one of the “washers” to restrain the stator from axial movement.

Abstract: A device for connecting sucker, or drive rods, consisting of a threaded coupling, one end of which has a right hand female thread and the other a left hand female, which joins the threaded pins of adjacent rods. The ends of the pins are equipped with dogs, or lugs, that interlock when the connection is made up, firmly linking the rods torsionally. The coupling serves only to keep the dogs, or lugs, engaged and to carry the tensional load on the connection. Such a connection provides a stronger torsional link between rods than connections currently available. The connection also does not require the special make-up procedure of the current systems and cannot over tighten or back off during operation.

Abstract: In a production apparatus for pumping production fluid to the surface of a well, a progressive cavity pump with a stator and a rotor in which the rotor has an extension which rests on a thrust bearing, lubricated by production fluid.

Abstract: A device for the threaded connection of tubular members, particularly as used in the petroleum industry, which provides both the full strength and near full internal diameter of typical oilfield tubular threaded connections, with the ability to securely join two cylindrical members with eccentric internal connections.

Abstract: A pressure compensating system that minimizes the pressure differences across multiple shaft seals in a rod driven downhole pumping apparatus. The system balances the pressures across the seals by forcing the external pressure of all seals and compensators to be equal to the highest external pressure in the apparatus, made possible by the appropriate use of labyrinth-type seals. A bleed valve assembly which allows free flow of fluid into the pressure compensating system, but restricts the rate of fluid outflow from the system in case of shut-in of the pump, to limit the potential of rapid opening and closing of the mechanical shaft seals.

Abstract: A downhole GCP pumping apparatus which accommodates eccentricities in the position of input and output shafts of the various elements of the assembly by connecting the drive rod string directly to noncentered shafts while maintaining the overall outside dimension of production tubing within the walls of the well hole.

Abstract: A direct drive pump employs an on-off tool to attach the drive rod string to a floating pump drive shaft in both torsion and tension. The downward thrust on the drive shaft, as well as the weight of the drive rod string, is born by a thrust bearing in the drivehead at the surface. A floater pump is used with this direct drive pump to permit the free vertical movement of the drive shaft. When a tandem direct drive pump is employed a housing containing a tandem pump drive shaft connector connects the shafts in an upper and lower tandem pump to permit the two to freely move in the tandem direct drive pump.

Abstract: A system for disengaging a power supply at the surface of a well from a downhole assembly having a pump for pumping fluid in the well to the surface thereof. A captured spline assembly interposed in the rod string, selectively connected to the downhole assembly to provide torsional drive.

Abstract: In a well extending from the surface of the earth to a deposit of production fluid there beneath, a system for delivering the contents of the deposit to the earth's surface. The system comprising a rod string capable of being driven by a source of motive power at the earth's surface, including an internally overshot assembly rod at the end of the rod string; a downhole assembly, including a pump and receiver with a shaft extending upwardly from the downhole assembly, the receiver shaft being connectable to the overshot assembly such that rotation of the rod string and overshot assembly drives the pump to push the production fluid to the surface of the earth.

Abstract: A device for connecting sucker, or drive rods, consisting of a threaded coupling, one end of which has a right hand female thread and the other a left hand female, which joins the threaded pins of adjacent rods. The ends of the pins are equipped with dogs, or lugs, that interlock when the connection is made up, firmly linking the rods torsionally. The coupling serves only to keep the dogs, or lugs, engaged and to carry the tensional load on the connection. Such a connection provides a stronger torsional link between rods than connections currently available. The connection also does not require the special make-up procedure of the current systems and cannot over tighten or back off during operation.

Abstract: A spin-through rod centralizer consisting of a stator constructed of plastic, or other appropriate material, which is mounted on the rod coupling which provides the bearing surface for rotation of the coupling within the stator. The stator, which is free to rotate on the rod coupling and, hence, would move freely axially along the coupling, is restrained from such axial movement by two steel “washers” that are captured between the rod shoulders and the coupling when the connection between two rods is made up. The washers are slightly larger in diameter than the coupling and thereby keep the stator located on the coupling, yet do not restrict the relative rotation between the coupling and the stator. This coupling mounted centralizer will not interfere with rod string make-up when using equipment in common use. An alternative configuration uses a coupling with a shoulder at one end that acts as one of the “washers” to restrain the stator from axial movement.

Abstract: A pressure compensating system that minimizes the pressure differences across multiple shaft seals in a rod driven downhole pumping apparatus. The system balances the pressures across the seals by forcing the external pressure of all seals and compensators to be equal to the highest external pressure in the apparatus, made possible by the appropriate use of labyrinth-type seals. A bleed valve assembly which allows free flow of fluid into the pressure compensating system, but restricts the rate of fluid outflow from the system in case of shut-in of the pump, to limit the potential of rapid opening and closing of the mechanical shaft seals.

Abstract: In a production apparatus for pumping production fluid to the surface of a well, a progressive cavity pump with a stator and a rotor in which the rotor has an extension which rests on a thrust bearing, lubricated by production fluid.

Abstract: A noninvasive method for the affixing of a transmission in a downhole housing wherein the housing is deformed, creating an oval cross section, and inserting the transmission into the housing with the greatest cross section of the transmission being positioned along the major axis of the oval created and, thereafter, releasing pressure to cause said housing to return to its normal circular cross section.

Abstract: A system for disengaging a power supply at the surface of a well from a downhole assembly having a pump for pumping fluid in the well to the surface thereof. A captured spline assembly interposed in the rod string, selectively connected to the downhole assembly to provide torsional drive.

Abstract: A system for connecting and disconnecting a rod string from a downhole assembly in which a captured spline assembly is encased in a receiver attached to the downhole assembly and an on-off tool separating the rod string from the downhole assembly.

Abstract: In a well extending from the surface of the earth to a deposit of production fluid there beneath, a system for delivering the contents of the deposit to the earth's surface. The system comprising a rod string capable of being driven by a source of motive power at the earth's surface, including an internally overshot assembly rod at the end of the rod string; a downhole assembly, including a pump and receiver with a shaft extending upwardly from the downhole assembly, the receiver shaft being connectable to the overshot assembly such that rotation of the rod string and overshot assembly drives the pump to push the production fluid to the surface of the earth.

Abstract: In a gear transmission, pairs of spur drive gears provided with a helical cut spline on the inner diameter of the spur drive gears are mounted on a drive shaft provided with helical cut splines on the outer diameter of the drive shaft. The pairs of spur drive gears engage pairs of spur driven gears provided with a helical cut spline on the inner diameter of the spur driven gears mounted on a driven shaft provided with helical cut splines on the outer diameter of the driven shaft. In operation, there is equal load sharing among spur drive gears engaging the spur driven gears.